Swapping up to the 4.10s

[rharr]

Even AI recommends 5.13's, but you could get by with 4.88's!

https://www.google.com/search?q=what+gears+should+I+run+with+37s+on+a+diesel+gladiator&client=firefox-b-1-d&sca_esv=b3e0f23ec436779b&sxsrf=AHTn8zrQlSeIaN1P47vWptYsnJRe9bJUyA:1747700558179&ei=TssraLHBCu3NkPIPoKXkwQ4&ved=0ahUKEwixoMb347CNAxXtJkQIHaASOegQ4dUDCBA&oq=what+gears+should+I+run+with+37s+on+a+diesle+gladiator&gs_lp=Egxnd3Mtd2l6LXNlcnAiNndoYXQgZ2VhcnMgc2hvdWxkIEkgcnVuIHdpdGggMzdzIG9uIGEgZGllc2xlIGdsYWRpYXRvcjIEEAAYRzIEEAAYRzIEEAAYRzIEEAAYRzIEEAAYRzIEEAAYRzIEEAAYRzIEEAAYR0jgCFAAWABwAHgCkAEAmAEAoAEAqgEAuAEMyAEAmAIBoAIJmAMA4gMFEgExIECIBgGQBgiSBwExoAcAsgcAuAcA&sclient=gws-wiz-serp

Thread Closed. The AI has spoken.

Moving on what is the best oil for my white jeep star wars edition?

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[CrazyCooter]

Thread Closed. The AI has spoken.

Moving on what is the best oil for my white jeep?

I'm gonna have to start selling my clients the right gears from now on then? Ive been doing it all wrong!

The same oil I use because I drive a white jeep too......duh! Is there any other color?

 

[professorkx]

I ran 4.10 gears in my JK manual for 150k miles and never considered a gear change, and I swap gears in my shop, so could have made a change for the cost of parts. With the Gladiator, the expense to change from 4.10 gears just isn’t necessary with an automatic IMHO unless you tow.

My Gladiator isn’t a sports car…I already have one of those and I’m not working to change it into an off-road machine…I have a Gladiator for those duties.

 

[rharr]

I ran 4.10 gears in my JK manual for 150k miles and never considered a gear change, and I swap gears in my shop, so could have made a change for the cost of parts. With the Gladiator, the expense to change from 4.10 gears just isn’t necessary with an automatic IMHO unless you tow.

My Gladiator isn’t a sports car…I already have one of those and I’m not working to change it into an off-road machine…I have a Gladiator for those duties.

psst.. conversation is over, the AI has spoken.

 

[TheSolarWizard]

To me living in hill and Mountain terrain and 80% backwoods those mileage differences dont mean squat . It's the torque and power that I would be after I would have went with the lowest reduction and call it good .
Which did you take ?

4.56 is the right gear to have for 38s on the ecodiesel. 100% based on my research and is what people who build jeeps and differentials for a living generally agree with.

I have 42s and bigger axles now.
I found a really really good deal on them but they were already made and had 4.88s. I originally had a lighter 42 and it was good enough but not great. Even with the other stuff I have done underneath, and very expensive approach to keeping the Jeep as light as is possible while still being hard wheeling ready, with the nitto 42s im quite certain that the Jeep and my ass would both be happier with 5.13s.

4.56s with 37/38s
4.88s with 40s
5.13s with 42s
5.38s with 44s

those are the correct ratios for the ecodiesel and I would not recommend towing anything above a tear drop style trailer on 40s above and no towing at all at 42 plus.

on the low end ive been in or driven 50 different ecodiesel jeeps that are modified. Its like some weird club my instagram is full of meet up invites etc for diesels.

 

[CrazyCooter]

I ran 4.10 gears in my JK manual for 150k miles and never considered a gear change, and I swap gears in my shop, so could have made a change for the cost of parts. With the Gladiator, the expense to change from 4.10 gears just isn’t necessary with an automatic IMHO unless you tow.

My Gladiator isn’t a sports car…I already have one of those and I’m not working to change it into an off-road machine…I have a Gladiator for those duties.

.....and there you have it again........leave the factory installed 4.10 gears in your Ecodiesel equipped JT. It's not worth the expense!!?? AI would disagree, but.......

 

[Stan H]

.....and there you have it again........leave the factory installed 4.10 gears in your Ecodiesel equipped JT. It's not worth the expense!!?? AI would disagree, but.......

I totally get ypur 8 gears etc equals enough torque to move those big tires. But what your looking at is keeping the same torque curve as on 33" after placing on 38's . If a full range of all 8 gears and not just 1-5 then a regear would be proper . Not 100% necessary but it would put the truck in the same torque curve and shift points as with the 33's.

 

[professorkx]

.....and there you have it again........leave the factory installed 4.10 gears in your Ecodiesel equipped JT. It's not worth the expense!!?? AI would disagree, but.......

Well, if it’s recommended on the internet, it must be necessary. As for AI, remember, AI is not making an independent assessment, it’s just an information algorithm.

I’ve watched folks spend money for years on unnecessary mods just because it was discussed on a forum or there was a review video telling everyone how great the “thing” is.

To each his own, but stock isn’t bad just because it’s stock. Lifts and tires for ground clearance I can understand on a Jeep, but swapping 4.10 gears just because someone on a forum said it’s the shiznit is just dumb…IMHO.

As I have posted elsewhere, I’ve built serious rigs, including frame stretches, custom 4 link/3 link, body chops, custom bodies, motor/drivetrain swaps, gear swaps, etc, so I’ve spent a lot of money on current and past rigs for a specific use case.

In this discussion, I’m simply providing a different perspective…I guess being snarky is the best you’ve got…

 

[CrazyCooter]

You guys are proving the point....keep it up!

 

[Chance575]

I tow with 4.88s, too much gear go 4.56s.i have about 35k on my set.

 

['22JTRD]

If you want to keep the same final drive ratio, tire change percentage = gear ratio change percentage.

It's so simple you don't need a chart.

Doing the math that way comes out to 4.18

37/33 × 3.73 = 4.18

That's a 4.10 , not a 4.56

Just to be crystal clear, I live in Florida & don't tow with my JT or have it loaded down with Overland gear.

It's a Daily Driver and hunting rig. My reasons for lifting and bigger tires is getting up out of the water and mud.

Not looking for a better Hole Shot from the stoplight or Torqued up Rock rig with a better Crawl ratio.

It's not really even our preferred Highway road trip vehicle, we use our Navigator for long vacation trips

 

[UTDieselRubi]

The 4.56 will rev higher rpms than the 4.10 at the same speed

True, I just wasn't sure if big picture the 4.10s would get you in 7th more on freeways still, thus eating up more mpgs, but from the sounds of it, 4.10s are keeping in 8th often enough for many. The internal debate rages on...

 

[UTDieselRubi]

.....and there you have it again........leave the factory installed 4.10 gears in your Ecodiesel equipped JT. It's not worth the expense!!?? AI would disagree, but.......

Didn't think you could get 4.10s factory in a JT, I think they are all 3.73, even with max tow. (with a diesel)

 

['22JTRD]

True, I just wasn't sure if big picture the 4.10s would get you in 7th more on freeways still, thus eating up more mpgs, but from the sounds of it, 4.10s are keeping in 8th often enough for many. The internal debate rages on...

I hadn't had a problem staying in 8th with my Nitto Trail Grappler 35x12.5x17 on the 3.73 ( debated to 3.55 by the tire size ).

Going to the 4.10s only puts me at a .08 deficit from oem based on the simple math method of percentage of tire difference x 3.73.

It's completely situational , if I lived out West or was operating heavy due to a trailer or rtt & gear , I would have moved up to 4.56.

I only pull my boat trailer to my mechanic for service and he meets me at the ramp with his 1 ton every 100 hours.

Coolers loaded with ice and deer stands aren't enough weight to make me go to any higher ratio than what is closest to oem rpm range.

I have closed the chapter of life where I needed a full size tow rig for the boats and travel trailers I've had.

That towing was done with 3/4 & 1 ton crew cab diesels and I flat towed my 85 4Runner on 36s to hunt out of.

 

['22JTRD]

Didn't think you could get 4.10s factory in a JT, I think they are all 3.73, even with max tow. (with a diesel)

All ecodiesel models come 3.73 only.
I am swapping the oem 3.73 with the 4.10 set from Spicer that are in the gassers.

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